OBIS joined the marine programme of the World Heritage Centre to embark on a new UNESCO global citizen science initiative, called eDNA Expeditions in marine World Heritage sites, aiming to measure marine biodiversity, across 25 UNESCO World Heritage sites, while also measuring possible impacts of climate change on distribution patterns of marine organisms. The project will focus on fish and other marine vertebrates, with special attention to vulnerable and endangered species as specified through the IUCN Red List of Threatened Species, as well as those reflected in World Heritage sites’ Outstanding Universal Value.